lib_common.h

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 * Copyright (c) 2011-2023 CESNET, z. s. p. o.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef LIB_COMMON_H
#define LIB_COMMON_H
 
#include "host.h" // UNIQUE_LABEL
 
#define MK_STATIC(A) A, NULL
#define MK_STATIC_REF(A) &A, NULL
 
#ifdef BUILD_LIBRARIES
#include <dlfcn.h>
#define MK_NAME(A) NULL, #A
#define MK_NAME_REF(A) NULL, #A
 
#define NULL_IF_BUILD_LIBRARIES(x) NULL
 
#else /* BUILD_LIBRARIES */
 
#define MK_NAME(A) A, NULL
#define MK_NAME_REF(A) &A, NULL
 
#define NULL_IF_BUILD_LIBRARIES(x) x
 
#endif /* BUILD_LIBRARIES */
 
#ifdef __cplusplus
#include <list>
void open_all(const char *pattern, std::list<void *> &libs);
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
enum library_class {
        LIBRARY_CLASS_UNDEFINED,
        LIBRARY_CLASS_CAPTURE_FILTER,
        LIBRARY_CLASS_AUDIO_CAPTURE,
        LIBRARY_CLASS_AUDIO_PLAYBACK,
        LIBRARY_CLASS_VIDEO_CAPTURE,
        LIBRARY_CLASS_VIDEO_DISPLAY,
        LIBRARY_CLASS_AUDIO_COMPRESS,
        LIBRARY_CLASS_VIDEO_DECOMPRESS,
        LIBRARY_CLASS_VIDEO_COMPRESS,
        LIBRARY_CLASS_VIDEO_POSTPROCESS,
        LIBRARY_CLASS_VIDEO_RXTX,
        LIBRARY_CLASS_AUDIO_FILTER,
};
const void *load_library(const char *name, enum library_class, int abi_version);
void register_library(const char *name, const void *info, enum library_class, int abi_version, int hidden);
void list_modules(enum library_class, int abi_version, bool full);
bool list_all_modules();
#ifdef __cplusplus
}
#endif
 
#ifdef __cplusplus
#include <map>
#include <string>
std::map<std::string, const void *> get_libraries_for_class(enum library_class cls, int abi_version, bool include_hidden = true);
#endif
 
#define REGISTER_MODULE_FUNCNAME(name, info, lclass, abi, funcname, hidden) static void funcname(void)  __attribute__((constructor));\
\
static void funcname(void)\
{\
        register_library(#name, info, lclass, abi, hidden);\
}\
struct NOT_DEFINED_STRUCT_THAT_SWALLOWS_SEMICOLON
 
#define REGISTER_MODULE_FUNC_FUNCNAME(name, func, lclass, abi, funcname, hidden) static void funcname(void)  __attribute__((constructor));\
\
static void funcname(void)\
{\
        const void *info = func();\
        if (info) {\
                register_library(#name, info, lclass, abi, hidden);\
        }\
}\
struct NOT_DEFINED_STRUCT_THAT_SWALLOWS_SEMICOLON
 
#define REGISTER_MODULE(name, info, lclass, abi) REGISTER_MODULE_FUNCNAME(name, info, lclass, abi, UNIQUE_LABEL, 0)
 
#define REGISTER_MODULE_WITH_FUNC(name, func, lclass, abi) REGISTER_MODULE_FUNC_FUNCNAME(name, func, lclass, abi, UNIQUE_LABEL, 0)
 
#define REGISTER_HIDDEN_MODULE(name, info, lclass, abi) REGISTER_MODULE_FUNCNAME(name, info, lclass, abi, UNIQUE_LABEL, 1)
 
#endif // defined LIB_COMMON_H